feat: Add support for account abuse detection (#11001)

This PR adds service to automate account abuse detection. Currently
based on the signup name and URL, could potentially add more context
such as usage analysis, message metadata etc.

db/migrate/20250228185548_add_internal_attributes_to_accounts.rb

@@ -0,0 +1,5 @@
+class AddInternalAttributesToAccounts < ActiveRecord::Migration[7.0]
+  def change
+    add_column :accounts, :internal_attributes, :jsonb, null: false, default: {}
+  end
+end